So, first, the Renee Fleming. Singing along with Pavarotti has to be difficult for anybody. I like the way Fleming does three very distinct notes at the climax of the piece. I doubt I could understand it without that.
The second is the Sutherland one. One watches her sing and has to think there is no finer instrument than the human voice. She does the climax with only a small (considering the scale of the moment) gesture at the three notes.
And then there is this not as good recording but more of the definitive edition. Callas, and she does what she wants. You expect the three notes to be somehow indicated, but she does no such thing, soaring on an apotheosis of sound. Makes the Fleming seem powerless. Hear it twice for greater pleasure.